HNM
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- Extension: hnm
- Company: CRYO Interactive Entertainment
HNM is a multimedia format used in many computer games by CRYO.
During it's lifetime, format has been changed at least 6(+1) times.
- HNM (0) aka HNM Zero. Used in debut Cryo' games - Dune (floppy version) and KGB to display animated Cryo' logo. Uses typeless chunks and single rotated palette for the whole movie. No sound.
- HNM (1) Improved version, with typed chunks, dynamic palettes and (optional) soundtrack.
- HNM4 First version, where HNM tag explicitly written in the file header. Used in many games released during 1995-1997.
- HNM4 (A) Hi-resolution format spin-off, used in ALIENS game. While all file tags indicates genuine HNM4, interframe (de)compression is not compatible.
- UBB2 Another spin-off, used exclusively in MegaRace 2 game. Same file structure as in HNM4, but completely reworked codec.
- HNM6 Finally, movies comes in hi-color. Audio is also compressed now.
- Currently, Kheops Studios uses HNM-successor called KSV to carry XviD-encoded FMVs.
This forum discusses the coding algorithms used in the format: http://dune2k.com/forum/index.php?topic=18539.90